A friend of mine has a juwel 33 or 34, (he says its a 33 but postwar) and he says the flame doesn't go blue and that it fades and then dies. what's likly to be the cause? To a newbie like me it sounds like it's losing pressure fairly quickly? tar in advance m
Hi It is likely to be an air leak or faulty non return valve. It sounds as if it is not maintaining pressure. Tell your friend to pump up the stove and shove it in a bucket of water. If it is losing pressure he should see bubbles where the leaks are. If it is an old stove it is always worthwhile replacing all seals as they deteriorate with age Do you walk your dog across the Scrambles? Regards Bryan
Hi Sorry I was not familiar with the model If you live near Belmont I will lend you a tank lid allowing you to pressurise the tank. However as it is a petrol stove it is probable that it has been used with leaded petrol which chokes the burners. Basically when the tank is preheated there is enough pressure to light at the burner but the burner does not create enough heat to maintain the pressure so vapourised fuel stops getting to the burner head Regards Bryan
how do, I'll tell him to use the pricker first then try the pump n dip (with an empty of petrol tank I guess? ). the scambles? everywhere up 'ere's a scramble when it's windy, icy or snowy 8) m
hi Unfortunately the 33 & 34 are petrol stoves without a pump. Pricking the nipple may help as replacing it may help. However the problem with petrol stoves in the UK is that they were designed for unleaded petrol which was not available until the 1970s. Up until then they were used with leaded petrol which had additives in it. These additives changed to a carbon like material and completed blocked the tubes through the burners. It is possible to clean the burners using the method shown here https://classiccampstoves.com/posts/59584 You have to remove burner from tank before you clean it out. You are likely to explode the tank if you heat it in place Regards Bryan
Tar, I on a Jewel 34 and it is in nearly every respect identical to the Svea 123 and the Optimus 80 except the Jewel 34 is made of steel. Ask your friend; or you can do this, with the tank empty of fuel, shine a light into the fuel filler opening nd there should be observed a cotton wick similar to mop yarns. If it is dirty or charred looking then the stove will not operate. The suggestion for seals should be your best option though.
Yep, I think your original diagnosis is most likely -- pressure is not being maintained. Most likely a cap gasket problem and an easy fix.
I had that problem recently with a 00. I then added more fuel and the problem went away. The fuel level was so low it did not take much to lose pressure I guess.
The first question I would ask is: What fuel is in it? It should be White gasoline AKA Coleman Fuel or in the UK, Panel Wipe. Next question: Is the fill cap gasket hardened or split? New ones are available from "The Fettle Box" If those don't get the stove moving, they check the fuel wick. I'll wager the fill cap gasket and fresh fuel will do the trick. --././.-./.-./-.--/
